Mammoth Uncensored Word List:
32 words ending with ly, 20 letters long

antiinsurrectionally autolithographically autoradiographically biostratigraphically chemoautotrophically chemotherapeutically crystallographically electrohydraulically ethnomusicologically existentialistically histomorphologically hydrometallurgically immunocytochemically microphotometrically neurophysiologically neuropsychiatrically nonstereoselectively nontrigonometrically overenthusiastically overrepresentatively pathophysiologically photoautotrophically phytophysiologically plethysmographically pseudoasymmetrically pseudoscientifically psychopathologically radiotelegraphically roentgenographically syncategorematically ultramicroscopically uncharacteristically